Final answer:
To make a profit of at least $750, any number of tokens can be sold.
Step-by-step explanation:
To determine the number of tokens that can be sold to make a profit of at least $750, we can set up an inequality using the given information. Let's let x represent the number of tokens sold. The cost of purchasing x tokens is 4x dollars. The fair bought the thrill ride for $3000, so the total cost is 4x + 3000 dollars. To make a profit of at least $750, the total revenue must be greater than or equal to the total cost plus $750. Therefore, the inequality is 4x + 750 ≥ 4x + 3000. We can subtract 4x from both sides to get 750 ≥ 3000. Since this inequality is always true, there is no specific number of tokens that need to be sold to make a profit of at least $750. Any number of tokens sold will result in a profit of at least $750.